Study of the Dependency on Magnetic Field and Bias Voltage of an AC-Biased TES Microcalorimeter
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Updated: Apr 10, 2026

X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells
Published on: August 20, 2019
L Gottardi1, J Adams2, C Bailey2
1SRON National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands.
Abstract:
At SRON we are studying the performance of a Goddard Space Flight Center single pixel TES microcalorimeter operated in an AC bias configuration. For x-ray photons at 6 keV the pixel shows an x-ray energy resolution ΔE =3.7 eV, which is about a factor 2 worse than the energy resolution observed in an identical DC-biased pixel. In order to better understand the reasons for this discrepancy we characterised the detector as a function of temperature, bias working point and applied perpendicular magnetic field. A strong periodic dependency of the detector noise on the TES AC bias voltage is measured. We discuss the results in the framework of the recently observed weak-link behaviour of a TES microcalorimeter.
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